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help !!!! We have identified "STOP (Djvu)". This ransomware may be decryptable under certain circumstances.


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Hello @peni,

 

Welcome to the Emsisoft Support Forums.

 

I understand it is frustrating, but currently, we are not aware of any ways to decrypt files with Online-ID and some recent forms of STOP(DJVU).

 

Please read this Topic. It contains information about your situation and whether or not your files can be decrypted.

https://support.emsisoft.com/topic/32045-about-the-stopdjvu-decrypter/

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On 10/17/2021 at 2:25 PM, peni said:

an online, decryption is impossible

Why did this happen?

This 'STOP Ransomware' enters the PC due to the fact that computer is poorly protected. People often use free antivirus programs with the 'Free' label in the name. None of these programs will protect PC from programs similar to 'STOP Ransomware', because basic protection is not capable of this feat.
If users used comprehensive protection of the 'Internet Security' class, then it would help protect PC from ransomware attacks.

There is no 100% protection against malware, but what the 'Free' antivirus gives is 1-2 percent protection. 

After this attack, PCs could have stayed other malware elements. This maybe is an info-stealer and something else. Therefore, it is urgent to conduct a full check and destroy malware.

Use an comprehensive anti-virus software such as Emsisoft Anti-Malware to effectively remove the malware. 
You can get a free trial 30-days version of Emsisoft Anti-Malware here: https://www.emsisoft.com/en/home/antimalware/

It will help you clean your PC from other malware for free.

!!! You need to neutralize all malicious files in the system. This should be done as quickly as possible. Otherwise, the files may be encrypted using the online ID and decryption will never be possible.

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Only after neutralizing all malicious files ...

I recommend this following method only when there is no other way... 

This is not the decryption, it is the recovery of certain types of files using the features of these files.

1) If you have encrypted ZIP/RAR archives, you can partially recover them. Only 1-2 files are damaged there. Remove the extension that the ransomware added to the archives, and extract the files in the usual way. Everything except 1-2 files will be fixed. If there is only 1 file in the archive, then it will most likely be unrecoverable.

2) There is an alternative (additional) way to recover some media files:
WAV, MP3, MP4, M4V, MOV, 3GP.

https://www.disktuna.com/media_repair-file-repair-for-stop-djvu-mp3-mp4-3gp

But before trying the alternative variant with media files, it is recommended that you make a copy of the encrypted files. Something will be restored better, something will be restored worse. 

Some types of files can be opened (restored) using the application in which they were created. To do this, you must first remove the extension added by the ransomware. Then can try to open the file from the program in which it was created. If you open audio and video files in the editor, it will restore the structure, and upon closing it will offer to save the changes in the file.

3) If you have PDFs or files of other e-books, then they may suffer in part if they were not protected from manual modification. Therefore, after removing the added extension, they can be partially read (~ 80%).

Unfortunately, it is not yet possible to recover files created in MS Office applications due to their sensitivity to any damage. They can be easily damaged without encryption. It is easier to recover and read text written on paper or on the stone than one created in MS Office.

An alternative method for other files has not yet been found. I understand that this will not be enough, but recovering some of the files is better than to lose everything...

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